DeFi Smart Contract Vulnerabilities Audit Guide

Here are three of the most common and high-impact DeFi smart contract vulnerabilities, along with specific detection methods using formal verification principles and static analysis techniques.

1. Reentrancy

Description:

Reentrancy occurs when a smart contract makes an external call to another contract (or itself) before its internal state is updated. An attacker can exploit this by recursively calling the vulnerable function, draining funds before the state change (e.g., balance update) is committed.

Specific Detection Methods:

• State-Read/Write-Order Analysis (CWE-367): Use static analysis tools (e.g., Slither, Mythril) to detect patterns where an external call (e.g., call, delegatecall, or send) occurs before a critical state variable (e.g., balances[msg.sender]) is updated. Example Pattern to Flag:

solidity
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